By citing the book The Tipping Point, the author intends to
A. [A] analyze the consequences of social epidemics
B. [B] discuss influentials' function in spreading ideas
C. [C] exemplify people's intuitive response to social epidemics
D. [D] describe the essential characteristics of influentials.
The author suggests that the "two-step-flow theory"
A. [A] serves as a solution to marketing problems
B. [B] has helped explain certain prevalent trends
C. [C] has won support from influential
D. [D] requires solid evidence for its validity
What the researchers have observed recently shows that
A. [A] the power of influence goes with social interactions
B. [B] interpersonal links can be enhanced through the media
C. [C] influentials have more channels to reach the public
D. [D] most celebrities enjoy wide media attention
The underlined phrase "these people" in paragraph 4 refers to the ones who
A. [A] stay outside the network of social influence
B. [B] have little contact with the source of influence
C. [C] are influenced and then influence others
D. [D] are influenced by the initial influential
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